David Reynolds, Business Development Manager. Halton Group Foodservice Division
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1 David Reynolds, Business Development Manager Halton Group Foodservice Division
2 M.E. DESIGN VIEW OF COMMERCIAL KITCHENS BLACK HOLE Sucking Energy from Building
3 Why are Campus Kitchens Overlooked for Energy Efficiency? Not always the Facility Manager s responsibility? Is Kitchen area managed by Foodservice Contractor? Excess (Wasted) air is invisible Usually not monitored or managed because it is undetected loss Can reduce both Electric & Gas bills WHY? Make up Air (MUA) usually heated or cooled (Costly air replacement!!!) Kitchens: Negative pressure designs (Pulls bldg. air to kitchen) Additional MUA supplied from Office/ Open area HVAC system Kitchen energy isn t directly monitored or separated on bill Implement sub metering to define actual usage in space Less Exhaust air = Less Make Up Air (MUA) required If excess Exhaust CFM controlled, then Supply (MUA) reduced to match
4 Kitchen Energy Overproduction! Existing kitchen hoods used much higher design exhaust CFM/per lineal ft. standards Estimate: 20% higher CFM s (very inefficient vs. current day!!!) More efficient kitchen hood design parameters are used today Retrofit kits can reduce existing overall kitchen exhaust CFM s M.E. firms generally add a safety factor to roof fan H.P. sizing assuring good ventilation in kitchen space (no smoke) Estimate: 10 25% depending on the project/ application Be Aware: New ASHRAE 90.1 (2010) code standards will limit/ reduce the CKV Exhaust CFM s allowed in new facilities Won t affect existing kitchens, but shows importance on energy focus For New Construction/ Renovation Kitchens (over 5,000 CFM) CKV energy saving options will be required (e.g. choice of DCV)
5 Typical Commercial Kitchen energy consumption footprint 5 10% 10 15% 40 60% 40 60% HVAC Kitchen Equipment Lighting Cooler Freezer & other Buildings with commercial kitchens are one of the highest energy consumers of all building types HVAC (CKV) & kitchen equipment contribute up to 80% of total dining service building energy consumption
6 How to reduce Kitchen Energy Consumption in Campus Dining Utilize Whole Building Design approach Design efficient HVAC (CKV) system Minimize kitchen hoods exhaust airflow Use High Efficiency Kitchen exhaust hoods Use Demand Controlled Ventilation (DCV) Select efficient Kitchen equipment Energy efficient cooking equipment is available Energy Star models Both Gas and Electric models Lower BTU or KW inputs
7 DCV Adaptable to most Kitchens DCV (Demand Controlled Ventilation) is an automatic control system that regulates (and balances) the kitchen hood exhaust and make up airflow based on demand from cooking process Supplies the right amount of energy, at the right time, and right when and where it s needed Kitchens > 5,000 CFM: DCV usually has effective ROI Appliance status COOKING IDLE OFF Hood status Operates at Maximum design airflow (Exhaust CFM) Modulates BELOW Max. design airflow (reduced by 20 50%) Off (No hood airflow)
8 DCV SystemModels Exhaust Temperature + Cooking Activity Sensor Two types of DCV cooking activity sensors available 1) Infrared light beam across the hood to detect visible smoke or steam associated with the beginning of cooking process 2) Infrared array temperature sensors continuously monitor surface temperature of appliances under the hood Minimum exhaust fan speed default = 60% of design exhaust airflow Option: Single Hood VS. Multiple Hood on Common Fan/ Ductwork Temperature Only Minimum exhaust fan speed default = 80% of design exhaust airflow for systems with constant exhaust temperature set point Delayed responsiveness with temperature sensor only at duct collar and no secondary activity sensor capability If DCV has constant Exhaust Temperature Set point (Variable) Settings must be adjusted from Winter to Summer months
9 DCV Control Systems types Energy Management Control Systems (EMS) Energy controls monitoring a specific area/ function Sub metering required for optimal energy management Building Automated System (BAS) Integrated systems approach for multiple EMS control systems in the building DCV systems can usually be integrated easily BACnet, Modbus, and LonWorks are common protocols used List of monitored Control Points (Metrics) supplied to Architect (Design Team) in design process assures BAS control wiring diagrams are complete
10 DCV Systems = Calculation Data HEAT Example (Energy Savings Analysis Software) Data Inputs Weather City Hours of Operation: Hrs/Day Days/Wk Wks/Year Energy Costs: Electric and Gas CKV System: Design CFM Exhaust/ Make up Air requirements Costs: Ventilation System (Kitchen Hoods & DCV system control) Energy Modeling Schedules by Market Report Calculates Annual Energy Savings Electric Energy Reduction (kwh/ per year) = $$$ Gas Energy Reduction (Therm/ per year) = $$$ Greenhouse Gas Reduction (Lbs. of CO2 ) = $$$ TOTAL PAYBACK SAVINGS (ROI) = $$$ Used as Utility Energy Rebate Submission support documents
11 DCV Case Study Evaluated Site Configuration Four canopy hoods attached to single exhaust fan Demand control ventilation (DCV) installed Design Exhaust Airflow = 11,290 CFM Balancing dampers installed on each hood to independently regulate exhaust proportional to actual cooking demand
12 DCV CONTROLS YIELD BIG SAVINGS! Energy Impacts Kitchen Hood System w/ Single Roof Fan/Duct Heating [Therms] $1.20/Therm Estimated Savings Cooling [kwh] $0.12/kWh Exhaust Fan [kwh] Supply Fan [kwh] DCV w/ Dampers (Individual Hoods) 1,307 7,425 38,075 12,692 DCV w/o Dampers (All Hoods operate as Total System) 436 2,475 15,705 5,235 Energy Difference 871 4,950 22,370 7,457 Energy Cost Savings/YEAR $1045 $594 $2684 $895
13 Energy Systems require Routine Preventative Maintenance After installation, HVAC/ CKV systems should be optimized by DCV manufacturer and/or BAS Controls contractor Start up: Assures installation per M.E. design specification Energy management system (EMS) monitor/control sensors require occasional system checks to assure proper operation Operation: Monitoring does not equate to Control Routine calibration is recommended to assure maximum energy savings and comfortable working/dining conditions all day Automatic DCV controls detect system weakness in HVAC Reduces overall costs because Emergency Fixes cost more than Preventative Maintenance solutions Examples: Roof fan issues, Ducts, Space Temp. spikes, etc.
14 Summary of Key Points MOST CAMPUS KITCHENS AREN T MONITORED COMMERCIAL KITCHENS ARE HUGE ENERGY CONSUMERS SUB METERING ALLOWS SPACE ENERGY MONITORING DEMAND CONTROLLED VENTILATION (DCV) MATCHES ENERGY USAGE = ENERGY REQUIRED ENERGY MANAGEMENT: EMS & BMS/BAS SYSTEMS ENERGY MONITORING IS NOT ENERGY MGMT. SET CONTROL POINTS FOR BMS/BAS SYSTEM (METRICS) SAVE BOTH MONEY & TIME OVER TIME ROUTINE PREVENTATIVE MAINTENANCE A MUST TURNS EMERGENCIES INTO SCHEDULED MAINTENANCE
15 COLLEGE & UNIVERSITY DCV SITES Dartmouth College* Francis Tuttle Culinary* Oklahoma University* Bellingham Technical College* Whitworth University* Harvard GSE* Univ. of Saint Thomas* University North Dakota* Western Kentucky Univ.* SDCCD (Miramar College)* * Real time Internet Monitoring (including alarms sent to Facilities staff) * First Year Monitoring included with new MARVEL system * Requires Annual Energy Monitoring contract (HGS) Boston College University of Colorado UCSD Stuart Commons UCLA South Campus Univ. of Hawaii West Oahu George Brown College University of Wisconsin Colorado College Oklahoma State Univ. St. Johns University Berklee College of Music McMasters University
16 Questions? David Reynolds Business Development Manager
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